CN110064696A - A kind of asynchronous binder drawing and moulding mold and its moulding process - Google Patents

Abstract

The invention discloses a drawing die for asynchronous pressing, comprising an upper die body, a lower die base, a convex die and a concave die, the concave die is arranged at the lower part of the upper die body, and the punch is arranged on the lower die holder The upper part of the punch is fixed on the lower die seat, the outer side of the punch is provided with a movable lower edge holder, the center of the punch is provided with a movable core, the punch and the core are slidably fitted, the concave The die is fixed on the upper die body to form a fixed punch. The outer side of the concave die is provided with a movable upper edge holder. The upper surfaces of the mold and the support core are oppositely arranged for sheet metal forming. The small-curvature back door inner panel is not synchronized with the blank holder ring drawing mold to achieve multiple drawing forming in one process, which solves the problem of insufficient wrinkling and cracking of the aluminum alloy parts of the small-curvature complex inner cover. The drawing quality is improved; and the stamping can be completed in one time, which reduces the cost.

Description

A kind of asynchronous pressing material drawing die and its forming process

technical field

The invention relates to the technical field of drawing and forming, in particular to a drawing and forming die for asynchronous pressing and a forming process thereof.

Background technique

The structure of the existing drawing die is shown in Figure 2. It is mainly composed of three major components: a concave die, a blank holder and a punch. The drawing process is as follows: at the beginning of stamping, the concave die descends with the slider on the press, and the concave die contacts the plate. The plate and the blank holder are further lowered with the press, and at the same time, the lower gas point of the press presses against the mold gas ejector pin and the blank holder. Press the plate and the blank holder down to the dead center. At this point, the die, the blank holder and the punch are closed with the press to the dead center to complete the drawing of the plate; with the return of the press, the die follows the press. The slider rises, the plate is under the press with the air cushion against the mold air ejector rod and the blank holder rises for a stroke, the punch does not move, the plate is released from the punch, the plate is removed, and a complete die stamping process is completed. .

The existing drawing die structure is widely used in the stamping die of automobile cover parts, and its structure is simple and can meet the drawing and stamping requirements of simple cover parts. It is not ideal for automotive interior panels with special product shapes. Typical panel back door inner panels, especially aluminum alloy back door inner panels with small curvature and complex drawing, these products are characterized by flat flange area and low tension. The extension depth is shallow and the product shape is complex. If such parts are drawn and formed according to the conventional process, there will be insufficient formation of the flange area, complex shape changes and sharp position cracking, accompanied by severe wrinkling. In actual mold manufacturing, these problems cannot be completely solved by debugging, which will not only reduce the quality of automobile panel products, but also affect the mold manufacturing cycle. Secondary deep drawing is one of the means to solve this problem, but adding a drawing process means adding a set of stamping dies and increasing development costs.

SUMMARY OF THE INVENTION

Aiming at the deficiencies of the prior art, the technical problem to be solved by the present invention is to provide a drawing die and its forming process with asynchronous pressing, which can draw and form a small-curvature aluminum alloy plate at one time.

In order to solve the above-mentioned technical problems, the technical scheme adopted in the present invention is:

A non-synchronized pressing material drawing die, comprising an upper die body, a lower die base, a punch and a concave die, the concave die is arranged at the lower part of the upper die body, and the punch is arranged at the upper part of the lower die holder, so the The punch is fixed on the lower die seat, the outer side of the punch is provided with a movable lower edge holder, the center of the punch is provided with a movable core, the punch and the core are slidably matched, and the die is fixed on the A fixed punch is formed on the body of the upper die, and a movable upper edge holder ring is arranged on the outer side of the die. The upper surface of the oppositely arranged for sheet metal forming.

The punch and the core are guided and matched by a guide plate, and the punch structure is jointly formed by the two.

The upper edge holder is arranged on the upper die body through a nitrogen spring, the lower part of the support core is provided with a core gas ejector rod connecting post, and the lower part of the lower edge holder is provided with a lower edge holder gas ejector rod connection post, The lower die base is provided with air ejector rods corresponding to the core supporting gas ejector rod connecting post and the lower edge pressing ring gas ejecting rod connecting post respectively.

The support core is arranged corresponding to the flat part of the drawn product.

The fixed punch is set corresponding to the structurally complex part of the drawn product.

The bottom pressing ring and the fixed punch are guided and matched by a guide plate.

A forming process for a plate piece by using a different synchronous pressing material drawing die, comprising the following steps:

Working mold clamping stage:

1) Before the stamping work, the mold is in the open state, and the upper blanking ring is in the maximum stroke position;

2) When the press starts to work, the lower edge ring and the support core are under the action of the press gas ejector rod. It is transmitted to the lower edge ring and the core, so that the lower edge ring and the support core rise to the working state;

3) The upper die body, the concave die and the upper blank holder move downward with the press. The upper blank holder and the lower blank holder first contact and press the plate, and the nitrogen gas spring begins to compress to provide a constant blank holder force to the upper blank holder. circle to realize pressing;

4) The press continues to descend, and the upper and lower side-pressing rings press against the plate, and the plate and the support core are in the same stroke as the lower side-pressing ring under the action of the air ejector of the press. , at this time, the core begins to contact the plate and presses the plate with the die. At this point, the plate receives the external pressing force of the upper and lower edge blanking rings, and at the same time receives the internal pressure of the die and the core. force;

5) The upper die body, the female die and the upper blank holder continue to work with the press. At this time, the female die and the male die begin to participate in the drawing forming. Since the nitrogen gas spring constantly provides pressure to the upper blank holder, the lower blank holder and the upper blank holder will continue to work. The core is under the action of the die and the upper blank holder to the bottom dead center, and the plate is controlled by the pressing force both inside and outside.

Working mold opening stage:

1) The upper die body moves upward, and the nitrogen gas spring begins to release, which provides the return power for the upper blank holder. Before the upper die body and the female die are completely separated from the punch, the upper blank holder is pressed by the nitrogen spring pressure plate. Crimping ring fit;

2) As the press rises, the punch and die 1 begin to separate from the plate, and the plate is pressed by the upper and lower blanking rings. Under the action of the air ejector, it begins to rise;

3) When the press continues to rise and open the mold, the core begins to withstand the plate and starts to separate from the die;

4) As the upper die body continues to move upward, the upper edge holder and the lower edge holder begin to separate, the plate stops on the lower edge holder and the support core, and is separated from the punch, and the upper blank holder returns to under the action of the nitrogen spring. initial state;

5) The upper die body concave die and the upper blank holder continue to move upward with the press, and the die is fully opened;

6) The plate is removed, the air ejector of the press returns, the lower edge ring and the core return to the initial state, and the mold opening ends.

Compared with the prior art, the present invention has the following advantages:

The asynchronous blanking drawing die and its forming process are reasonably designed, and the asynchronous blank holder ring drawing die for the inner plate of the small curvature back door realizes multiple drawing forming in one process, and solves the problem of complex inner covering with small curvature. The problem of insufficient wrinkling and cracking in the drawing of aluminum alloy parts is improved, and the drawing quality is improved; and the stamping can be completed in one time, which reduces the cost.

Description of drawings

Below is a brief description of the content expressed in each of the drawings in this specification and the symbols in the drawings:

FIG. 1 is a schematic cross-sectional view of a drawing die of the present invention.

FIG. 2 is a schematic cross-sectional view of an existing drawing mold.

In the picture:

1. Lower die seat, 2. Punch, 3. Supporting core gas ejector rod connecting post, 4. Supporting core, 5. Lower pressing edge ring gas ejecting rod connecting column, 6. Lower pressing edge ring, 7. Upper die body , 8. Nitrogen gas spring, 9. Upper edge holder, 10. Die.

Detailed ways

The specific embodiments of the present invention will be described in further detail below through the description of the embodiments with reference to the accompanying drawings.

The non-simultaneous pressing material drawing die includes an upper die body, a lower die base, a punch and a concave die. The concave die is arranged on the lower part of the upper die body, the punch is arranged on the upper part of the lower die holder, and the punch is fixed on the lower die. On the seat, the outer side of the punch is provided with a movable lower edge ring, the center of the punch is provided with a movable core, the punch and the core are slidably matched, and the die is fixed on the upper die body to form a fixed convex The outer side of the concave mold is provided with a movable upper edge holder ring, the upper edge holder ring and the lower edge holder ring are arranged oppositely up and down, and the lower surface of the concave die is arranged opposite to the upper surface of the punch and the core for sheet metal forming.

The punch and the support core are guided and matched by the guide plate, and the two together form the punch structure. The lower edge ring and the fixed punch are also guided and matched by the guide plate.

The upper edge holder is set on the upper die body through a nitrogen spring, the lower part of the support core is provided with a support core gas ejector rod connecting post, the lower part of the lower edge holder is provided with a lower edge holder gas ejector rod connection post, and the lower die base Corresponding to the core gas ejector rod connecting column and the lower edge ring gas ejector rod connecting column are respectively provided with gas ejector rods.

The support core is set corresponding to the flat part of the drawn product. The fixed punch is set corresponding to the complex structure of the drawn product. The small-curvature back door inner panel is not synchronized with the blank holder ring drawing mold to achieve multiple drawing forming in one process, which solves the problem of insufficient wrinkling and cracking of the aluminum alloy parts of the small-curvature complex inner cover. The drawing quality is improved; and the stamping can be completed in one time, which reduces the cost.

A preferred specific example is shown in Figure 1. The mold structure includes a lower die base 1, a punch 2, a support core gas ejector pin post 3, a support core 4, a lower edge holder gas ejector pin post 5, and a lower edge holder ring 6 , the upper die body 7, the nitrogen gas spring 8, the upper edge holder 9 and the die 10; the punch 2 is fixed on the lower die base 1; the core 4 and the punch 2 are guided and matched by the guide plate, and are connected to the lower die base with working bolts The working stroke is controlled by the stroke of the working bolt. The lower edge holder 6 is guided with the punch and is connected to the lower die base 1 through safety bolts. The die 10 is fixed on the upper die body 7, and the nitrogen gas spring is fixed on the upper die body. 7, the upper edge holder ring 9 is connected with the safety side pin and the upper die body 7 through the working side pin, the nitrogen gas spring acts on the upper edge holder ring 9, and provides pressure for the upper edge holder ring 7, and between the above contact parts The guide plate and the guide sliding surface cooperate and guide to realize the movement, and each component realizes its own movement function through the action of the press, and completes the drawing and forming of the inner panel of the back door.

Due to the complicated drawing depth and forming shape of the product, and at the same time to ensure sufficient drawing of the product, a concave die 10 and a punch 2 are set as the main drawing area; the concave die 10 is fixed on the upper die body 7, and the punch 2 It is fixed on the lower die base 1. The upper edge holder ring 9 and the lower edge holder ring 6 are arranged outside the main molding area. The upper edge holder ring 9 is provided with a constant molding force by the nitrogen gas spring 8; 4, and the lower edge holder 6 work simultaneously under the action of the air ejector of the press. With the further work of the press, the plate piece will work together with the upper edge holder ring 9, the lower side holder ring 6 and the support core 4. The drawing process is completed when the punch 2 and the die 10 are in contact.

In the stamping process, different from the traditional drawing die plate, after the rigid pressing surface of the die and the blank holder are in contact with the die and the punch, only the pressing surface of the die and the blank holder are pressed. Draw forming in the die is not controlled.

In this structure, during the working process of the press, the upper blank holder 9 goes down with the upper die body 7 and the concave die, and the upper blank holder 9 presses the plate and the lower blank holder 7 to the plate at a constant pressure on the nitrogen spring 8. When the parts are pressed down, the push-out force of the pneumatic rod will push up the lower edge holder 6 and the core 4. During the further clamping of the core 4 and the die 10, the plate parts begin to gradually contact between the die 10 and the core 4. And gradually compacted, in the continuous drawing and forming work, in addition to the above-mentioned plate compaction, the plate is fully drawn under the action of the die 10 and the punch 2. During the drawing process of the plate, the plate is pressed upward. The flow between the edge ring 9 and the lower edge holder 6 ensures that the plate is fully drawn and formed, and at the same time solves the stamping process problem of coexisting cracking and wrinkling of the aluminum alloy product with small curvature of the inner cover of the complex shape.

According to the product with small curvature and different depths, the forming punch and the movable core are set; the small curvature deep drawing area is set with a fixed punch, which is directly installed on the lower die seat, and the movable core is designed in the flat part of the product and is in contact with the die. Hold the sheet metal and work bolts to connect it with the lower die body. The stroke and the outer side blank holder of the product are determined by the specific stamping process.

According to the characteristics of small drawing curvature and large depth gap, in the sequence die structure, the upper die is designed as a fixed concave die inside the product and the outer side is designed as a floating upper blank holder, and the lower die is designed as a punch fixed and The movable support core, the movable support core and the lower edge ring work under the action of the press ejector rod, and are drawn and formed in different periods of stamping, and the structure is novel and effective. It can not only solve the insufficient forming of the shallow drawing area of the flange, but also ensure that the defects of sheet cracking and wrinkling of the sheet metal do not occur in the small curvature deep drawing area.

During the stamping process, the upper edge holder ring 9 and the lower edge holder ring 6 play the role of pressing the material, and at the same time the outer side also participates in the forming. Hold the sheet to control the pressing force of the inner flat part. Under the control of the inner and outer pressing force, the punch 2 and the die 10 complete the small curvature deep drawing, which can not only prevent the small curvature deep drawing The cracking of the area also avoids the wrinkling problem caused by the excessive feeding amount, and the sheet is fully stretched and rigid.

The molding process is as follows:

1. Working stage of mold clamping:

(1) Before the stamping work, the die is in the open state, at this time the nitrogen gas spring 8 is in a released non-working state, the upper edge holder 9 has reached the maximum stroke position, and the working side pin is in a stressed state;

(2) When the press starts to work, the lower edge ring 6 and the support core 4 are under the action of the press gas ejector rod, and the pressure of the press gas ejector rod passes through the lower edge ring gas ejector rod connecting column 5 and the support core gas ejector rod Connect the post 3, and transmit the force to the lower edge holder 6 and the support core 4 respectively, so that the lower edge holder ring 6 and the support core 4 rise to the working state.

(3) The upper die body 7, the female die 10 and the upper blank holder 9 move downward with the press, the upper blank holder 9 and the lower blank holder 6 first contact and press the plate, and the nitrogen gas spring 8 begins to compress to provide a constant The blank holder force is applied to the upper blank holder ring 9 to achieve material pressing;

(4) The press continues to go down, the upper edge holder 9 and the lower edge holder 6 press the plate and continue to move downward with the press, the plate and the support core 4 are under the action of the air ejector of the press and the lower edge holder In the same shape range, the support core 4 starts to contact the plate and presses the plate with the die 10, which is different from the traditional drawing and only has external blank holding force. The external pressing force of the blank holder 6 is simultaneously subjected to the internal pressing force of the die 10 and the core 4;

(5) The upper die body 7, the female die 10 and the upper blank holder 9 continue to work with the press. At this time, the female die 10 and the male die 2 begin to participate in the drawing forming. Since the nitrogen gas spring 8 constantly provides pressure to the upper blank holder 9. At this time, the lower edge holder 6 and the core 4 are under the action of the female die 10 and the upper edge holder 9 to the bottom dead center, and the plate is controlled by the pressing force both inside and outside. This structure effectively controls the cracking and wrinkling problems that occur in the drawing forming of the inner cover with complex small curvature, and the drawing forming process of the mold is over.

Second, the working stage of mold opening:

(1) The upper die body 7 moves upward, and the nitrogen gas spring 8 begins to release, which provides the return power for the upper edge holder 9. Before the upper die body 7 and the female die 10 are completely separated from the punch 2, the upper edge holder 9 receives The pressure plate of the nitrogen gas spring 8 is also attached to the lower edge ring 6;

(2) As the press rises, the punch 2 and the die 10 begin to separate from the plate, and the plate is pressed by the upper edge holder 9 and the lower edge holder. As the press rises, the lower edge holder 6 and the holder The core 4 starts to rise under the action of the gas ejector rod of the press;

(3) When the press continues to rise and open the mold, the core 4 begins to stand against the plate and starts to separate from the die 10;

(4) As the upper die body 7 continues to move upward, the upper edge holder 9 starts to separate from the lower edge holder 6, the plate stops on the lower edge holder 6 and the core 4, and is separated from the punch 2, and the upper edge holder 9 Return to the initial state under the action of the nitrogen gas spring 8;

(5) The upper die body 7, the concave die 10 and the upper blank holder 9 continue to move upward with the press, and the die is fully opened;

(6) The plate is removed, the gas ejector rod of the press returns, the lower edge holder 6 and the core 4 return to the initial state, and the mold opening ends;

It can be seen from the above working principle: the inner plate of the small-curvature back door is not synchronous with the blank holder ring drawing die. According to the characteristics of large drawing depth fluctuation and small curvature of the part, the traditional structure of the die structure is divided into a concave die. 10 and the upper blank holder 9, the punch is divided into the lower blank holder 6, the punch 2 and the core 4, which are formed in different periods of the stamping process, so as to solve the sufficient drawing forming of the flattened part and ensure a small curvature. Cracking and product wrinkling defects do not occur in the deep drawn area.

In summary, the asynchronous blank holder ring drawing tool for the inner panel of the small curvature back door realizes multiple drawing forming in one process, which solves the problem of insufficient wrinkling and cracking of the aluminum alloy parts of the small curvature and complex inner cover. , saving the mold development cost caused by adding processes to solve such problems. It improves the design and manufacturing level of the enterprise, and at the same time reduces the production cost for the automobile OEM, and brings good economic benefits.

The above description is only for the description of the preferred embodiments of the present invention, and the above technical features can be combined arbitrarily to form a plurality of embodiments of the present invention.

The present invention has been exemplarily described above in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited by the above manner, as long as various insubstantial improvements made by the concept and technical solutions of the present invention are adopted, or the If the concept and technical solutions of the present invention are directly applied to other occasions, they all fall within the protection scope of the present invention.

Claims (7)

1. a kind of asynchronous binder drawing and moulding mold, including upper mold body, lower die holder, punch-pin and cavity plate, the cavity plate are set In the lower part of upper mold body, the punch-pin is located at the top of lower die holder, it is characterised in that: the punch-pin fixation is located at lower die holder On, the outside of punch-pin is equipped with movable lower blank holder, and the center of punch-pin is equipped with mobilizable stooling, slides between punch-pin and stooling Cooperation, fixed be located in upper mold body of cavity plate form solid punch, and the outside of cavity plate is equipped with movable upper blank holder, the upper pressure Flange and lower blank holder are oppositely arranged up and down, and the lower surface of the cavity plate and the upper surface of punch-pin and stooling are oppositely arranged for plate Material molding.

2. asynchronous binder drawing and moulding mold as described in claim 1, it is characterised in that: pass through between the punch-pin and stooling Punch structure is collectively formed in guide plate guiding cooperation, the two.

3. asynchronous binder drawing and moulding mold as described in claim 1, it is characterised in that: the upper blank holder passes through nitrogen bullet Spring is located in upper mold body, and the lower part of the stooling is equipped with stooling pneumatic jack bar and connects column, and the lower part of lower blank holder is equipped with lower blank holder Pneumatic jack bar connects column, corresponds to that stooling pneumatic jack bar connects column and lower blank holder pneumatic jack bar connects column and is respectively equipped with pneumatic jack bar on the lower die holder.

4. asynchronous binder drawing and moulding mold as described in claim 1, it is characterised in that: the stooling corresponds to drawing product Flat part setting.

5. asynchronous binder drawing and moulding mold as described in claim 1, it is characterised in that: the solid punch corresponds to drawing production The setting of product structure is complicated position.

6. asynchronous binder drawing and moulding mold as described in claim 1, it is characterised in that: the lower blank holder and solid punch Between pass through guide plate guiding cooperation.

7. a kind of moulding process using the asynchronous binder drawing and moulding mold as described in any one of claim 1 to 6, feature Be: the moulding process the following steps are included:

Work matched moulds stage:

1) before press work, mold is in the open state, and upper blank holder is in maximum travel position；

2) when press is started to work, under the effect of press pneumatic jack bar, pneumatic jack rod pressure passes through lower blank holder for lower blank holder and stooling Pneumatic jack bar connects column and stooling pneumatic jack bar connects column, and power is delivered separately to lower blank holder and stooling, increase lower blank holder and stooling To working condition；

3) upper mold body is moved downward with cavity plate and upper blank holder with press, and upper blank holder is contacted and pushed down first with lower blank holder Plate, nitrogen gas spring start compression and provide constant blank holder force to upper blank holder, realize binder；

4) press continues traveling downwardly, and upper blank holder and lower blank holder are pushed down plate and continued traveling downwardly in work with press, plate and stooling Under the effect of press pneumatic jack bar and lower blank holder is in the same stroke, and stooling starts to contact plate and pushes down plate with cavity plate at this time Material, so far plate receives the outer pressure-plate-force of blank holder and lower blank holder, while the interior pressure-plate-force by cavity plate and stooling again；

5) upper mold body works on cavity plate and upper blank holder with press, and at this moment cavity plate and punch-pin begin participating in drawing and moulding, Since the constant offer pressure of nitrogen gas spring is to upper blank holder, descend at this time blank holder and stooling cavity plate and the effect of upper blank holder down toward Bottom dead centre, plate is under the inside and outside control all by pressure-plate-force, and cavity plate and punch-pin complete drawing and moulding, so far mold drawing and moulding Process terminates；

It works the die sinking stage:

1) upper mold body moves upwards, and nitrogen gas spring starts to discharge, and provides backhaul power for upper blank holder, in upper mold body and recessed Before mould completely disengages punch-pin not yet, upper blank holder is also bonded with lower blank holder by nitrogen gas spring pressure plate；

2) as press rises, punch-pin and cavity plate 1 start to be detached from plate, and plate is pushed down in upper blank holder and lower blank holder, with Press rises, and lower blank holder and stooling are begun to ramp up under the effect of press machine pneumatic jack bar；

3) during press continues to rise die sinking, stooling starts to withstand that plate starts and cavity plate is detached from；

4) as upper mold body continues up, upper blank holder starts to be detached from lower blank holder, and plate stops at lower blank holder On stooling, it is detached from punch-pin, upper blank holder returns to original state under nitrogen gas spring effect；

5) upper mold body cavity plate is continued up with upper blank holder with press, and mold fully opens；

6) plate is taken away, press pneumatic jack bar backhaul, and lower blank holder and stooling return to original state, and mold die sinking terminates.